U.S. Senator Dick Durbin wants Energy drink companies to stop marketing to children.
Durbin has sent a letter to the CEO's of Red Bull, Rockstar and Monster.
He is asking for an explanation for why the companies sponsor sporting events that target children.
Durbin said the companies have often claimed they do not market their drinks to youngsters.
But he said he is aware of multiple situations that contradict their claims, including a high school football tournament, and a motorcycle race for kids as young as 13 that is endorsed by Red Bull.
Durbin said his letter stems out of growing concerns during the past year about the potential health risks posed by energy drinks.